If you haven't used Grunt before, be sure to check out the Getting Started guide, as it explains how to create a Gruntfile as well as install and use Grunt plugins. You may install this plugin with this command:

An array of extensions dictating what files should be treated as content files. Content files are text files that have their bodies loaded into memory for transformation purposes and are later written to disk as html files.

The index of a file determines its position in listings such as menus. By default the plugin looks for files like 01-name.md. In this specific case the file will have the 01- removed and will take the first position in listings.